In the United States Fathers Day falls on third Sunday in June. A. the; 不填B. the; aC.

问题补充：

In the United States, Fathers Day falls on third Sunday in June.

A. the; 不填

B. the; a

C. 不填; the

D. a; 不填

答案：

(答案→)A. the; 不填

B. the; a

C. 不填; the

D. a; 不填

解析：序数词前要用定冠词the；表示月份的名词前不用冠词。